Rotary pneumatic pump.



LQLBQL v P. C. FESENBEK. ROTARY PNEUMATIG PUMP. APPLIOATION FILED 5121.11, 1911.

Patented Mar. 31, 1914.

entre srnns ser cme,

FREDERICK C. IESENBEK, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR,`BY MESNE ASSIGNMENTS, T0 HOWARD SMALL AND ALEXANDER H. BOYD, RECEIVERS 0F .KELLER MANUFACTUBING COMPANY.

ROTARY PNnUMA'rIc PUMP.

A Specification of Letters Patent.

Application ined september 11, 191 1.

Patented Mar. si, 1era.

Serial No. 648,686.

To all 'whom it may concerny Be it known that I, FREDERICK C. FEsnN--.

. ing had to the accompanying drawings.

By the phrase rotary pneumatic pump I mean to include both rotary suction pumps and rotary blowers, of the type in which 2, occupies the central axis ofthe pump.

blades rotate within a cylinder within which la hollow drum turns eccentrically, the

blades passingthrough slots in the periphery of the drum andfaccommodating themselves to its motion. Theperiphery of the drum is contiguous to the periphery of the cylinder, at one point of the latter, and intake Iand outlet orifices are provided one on either sideof this pointof contact. Such a. rotary pneumatic pump may be used to create suct-ion in connection with pneumatic cleaning apparatus or it may be used as a blower.

My invention relates particularly to the construction of the blade, and consists in supplementing its plate with a resilient lamina mounted iixedly in relation to the blade with a spaceintervening. When this plate and its lamina are received within the slot provided for them in the drum, a slight pressure is exerted, tending to press the two together. The resiliency of the lamina resists this pressure and keeps the-,external surfaces of the plate and the lamina in close contact with the corresponding edges of the slot in the drum.

I have villustrated a convenient embodi ment of my invention in the accompanying drawings, in which- Figure I, is an elevation (with one end removed), of a pneumatic pump embodying my invention. Fig, II, is a perspective View of. oneof the blades. The pump comprises the cylindrical casing 1, closed at both ends, which mayA be termed simply the cylinder. The fixed shaft rIhe cylinder is provided with an intake passage 3, and outlet passages 4,\which, as shown in the drawings, are protected by a muffler 5. A drum 10, is mounted within the cylinder so as to turn eccentricallyv therein, with its periphery always in contact at the point 11, with the inner surface of the cylinder, the point 11, being about mid-Way' between the intake 3, and the outlet t. The

drum 10, is provided with peripheral slots 12, 12, through which pass blades 13, which are pivoted upon the shaft 2, and reach to the inner periphery of the cylinder. Thus far I have described the elements common to pumps of this charac-ter, it being understood that the number of blades and oth'elpdetails" may vary.

Each of the blades comprises a hinge portion 15, the collar of'which surrounds and.

rotates upon the shaft 2, and also a plate 167 which is received in a slot 17, within the hinge portion. There is also fastened to the hinged portion, preferably by the same rivets by which the plate 1G, is held within its slot, a lamina 18, of the same outline as the plate 16, and parallel to it with a small intervening space. This lamina 18, is of resilient material preferably of steel and by reason of the space between it and the plate 16, is capable of offering resistance to any compressive force, tending to thrust the two together. If desired, the plate 16, may

be resilient, as well asthe lamina 18, .but I' prefer that the resiliency should chiefly reside in one of the two parts. y

The slot- 12, in the drum 10, throughwhich the blade passes has its edges beveled in both directions as shown, in order -to the better accommodate the varying positions in which the blade lies in relation to it.` The edges of this slot are so spaced as to place a slightbut sufficient pressure upon .the outer surfaces of the plate with its lamina where they pass through it, this pressure slightly pushing the lamina toward the plate as permitted by the interspace. The plate and its lamina are of the same shape and area, both completely filling the space within the cylinder between 4its periphery and the central axis, an'dfor pumping or blowing purposes the plate and its lamina act substantially'as' one maintainsa very close contact between'said edge o f the slot and the contiguous portions By my inof the blade, notwithstanding the rapidlygj varying relation of the two parts.' I thus secure a better air-tight Contact at this point than-rhasheretofore been obtained in pumps of this character. Also the jointis a noiseless one, the constant pressure preventingr rattling.

Having thus described-my inventiom- I claim: A

" A. rotary-pneumatic pump, including in combination a cylinder, a slotted drum vmounted eccentrically and rotating in said cylinder, blades mounted concentrically of said cylinder and extending" through the lslots in saidfdruny each of said bla-des com- 'prising a plate and a parallel lamina wim aninterspace, whereby said'lamin'a is free tivev adjacent side edges of the slot in the drum, throughwhich the blade passes.

' In testimony whereof, I have hereuntol signed'my name at Philadelphia, Pennsyl- Vania, this eighth day of September, 1911.

. FREDERICK C. FESENBEK: Witnesses: y

' JAMES H. BELL,

E. L. FULLERTON.' 

